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Question about quantum of excitations in QED

  1. Oct 20, 2013 #1
    About photons, in qed, I have not understood if there is difference between "the excitation modes of the EM field" or "the energy difference between these excitation modes". Sorry if I make a mess with these concepts.

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  2. jcsd
  3. Oct 20, 2013 #2

    UltrafastPED

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    There may be many excitation modes; the different modes represent different energies.
     
  4. Oct 21, 2013 #3
    So every photon is a single excitation mode or what?

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  5. Oct 21, 2013 #4

    UltrafastPED

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    Photons are the quantization of the modes of the electromagnetic field.
     
  6. Oct 21, 2013 #5

    dextercioby

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    The quantized modes of the free e-m field (in vacuum) are 1-1 related to the eigenstates of the number operator.
     
  7. Oct 22, 2013 #6
    Thanks to both for the answeres.

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